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I bought a Pioneer PL-510A turntable at a garage sale yesterday for $7. After I cleaned it off (they must have been smokers, it was really filthy), I found that it didn't have a single scratch on it. I am trying to set it up and am confused about something. I understand how the counterweight works on the main shaft to determine the tracking force. There is also another counterweight at right angles to the primary counterweight. It is on the same side of the pivot point as the other counterweight. The location of this counterweight can be moved with a set screw. It would have a tendency to put a torque on the arm. What is this for? How do I adjust it properly? The table also has a divise by Audio Technica that will lift the stylus off the record when it is done. The PL-510A is a completely manual turntable so this is a nice add on. I think I figured out how it works. The main thing I am confused about is that second counterweight.
Follow Ups:
I bought the exact turntable (my first) some 23 years ago, when I was in high school. ...Ah, the memories....I sold it about 5 years later, along with the owners manual, etc.The arm is NOT a unipivot, and that lateral balance weight position is NOT critical. I recall the Pioneer manual just said to adjust the weight to some preset distance from the arm, and forget it. I don't think you had to adjust it differently for various tracking forces, etc. Make sure to set the anti-skating to the same value as tracking force (roughly), or use some type of test record to set the anti-skate.
But just move the lateral balance weight to within about 1/2" of the end of the rod, forget it, and enjoy some music (assuming the cartridge is decent). I had a low-priced Grado on mine, and it was good combination.
It sounds like the antiskating force adjustment to me (nt)
Hi Gopher.
From my recollection the arm on this tt, is not a unipivot. But the thing is, unless the arm has a straight armtube, then it will but different loading on the bearings. How different depends on the weight of the cartridge. Thus you have a weight you can adjust, so that the weight distribution on the bearings can be adjusted according to the chosen cart. What you need to do, is to set the tt absolutely level. Then when the arm is balenced ( o g tracking force, and 0 g antiskate ), you slightly lift the front of the tt. If the arm moves to the right or left when you do this, you need to adjust the lateral balance. If you slide the weight all the way towards the base, the arm will go in one direction. If you slide the weight all the way out, the arm should go in the other direction. What you need to do, is to find the position where the arm dosenīt move, then it will be in balance. Once this is done, you can adjust the tracking force and the antiskating. Hope this helps, Lars.
Is the above pic kinda what your arm resembles? If it is then it is probably a unipivot arm. The other weight is to balance the curved arm so that the arm is not sitting in the groove crooked(incorrect azimuth). You should place the weight where it makes the bottom of the cart parallel to record surface whilst the record is playing. Also, the arm over the pivot will not be resting on the sides of the bearing housing if the weight is in the correct place, it should be free floating. Be sure to do this adjustment before doing vtf stuff, as a move of this weight can throw off vta.If possible, post a picture of your arm.
-Scott
I can't post a picture but your picture looks a lot like what I have. I am afraid I am not an expert on this stuff and had a difficult time understanding what you wrote. What do you mean by vtf and vta? Could you explain again a little bit slower? Thanks
The last sentence should read "Be sure to do this adjustment before doing vtf stuff, as a move of this weight can throw off vtf"
Not "...off vta"VTA has nothing to do with this... sorry.
vtf = vertical tracking force, in grams, the amount of pressure with which your stuls presses downupon the record
OK i'll slow down, there are two basic types of arm bearings, a standard type, which has two pivots, one, that allows for movement in the vertical direcition... allows arm to move up and down. THe other allows the arm to move from the outside edge of the record to the inside (on the horizontal plane). A 2 pivot arm bearing of this type would allow not allow the cartridge to roll to one side or another freely, this allows the manufacturer to not really consider how an "s" shaped arms weight is distibuted. THus no second counterweight
BUT... A unipivot is different, the bearing is a single point, analagous to balancing a ruler on the tip of a nail. This allows the arm to move in the two dimensions listed above, but it also allows the cartridge to rotate from vertical with the record as shown in the pic. Since one side of an s-shaped arm will weight more than the other (blue part of illustration). THis would make that side of the cart torque down. To counteract this , you need an additional counterweight on the lighter side of the arm(red part), which needs to be adjusted depending upon the mass of the headshell and cart. Of course, you would want to adjust the counterweight so that the bottom of the cartridge is parallel to the record surface.
Check out stuff in the faq about tt and cart setup.
Hope this wasn't too jumbled.
-Scott
Hi,The Audio Technica Safety Raiser p/n AT6006, has sold for over $100.00 second hand on e-bay.
If you have a fully functional model, you stumbled on a great bargain. See link below for a picture.
http://www.audioasylum.com/audio/vinyl/messages/47997.html
Best regards,
Brian Kearns
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